linux-kernel - Re: 0xB16B00B5? Really? (was Re: Move hyperv out of the drivers/staging/ directory)

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Message-ID: <20120719210709.GA32031@kroah.com>
Date:	Thu, 19 Jul 2012 14:07:09 -0700
From:	"Greg KH (gregkh@...uxfoundation.org)" <gregkh@...uxfoundation.org>
To:	KY Srinivasan <kys@...rosoft.com>
Cc:	Paolo Bonzini <pbonzini@...hat.com>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"virtualization@...ts.osdl.org" <virtualization@...ts.osdl.org>
Subject: Re: 0xB16B00B5? Really? (was Re: Move hyperv out of the
 drivers/staging/ directory)

On Thu, Jul 19, 2012 at 02:11:47AM +0000, KY Srinivasan wrote:
> 
> 
> > -----Original Message-----
> > From: Paolo Bonzini [mailto:paolo.bonzini@...il.com] On Behalf Of Paolo
> > Bonzini
> > Sent: Friday, July 13, 2012 6:23 AM
> > To: KY Srinivasan
> > Cc: Greg KH; devel@...uxdriverproject.org; linux-kernel@...r.kernel.org;
> > virtualization@...ts.osdl.org
> > Subject: 0xB16B00B5? Really? (was Re: Move hyperv out of the drivers/staging/
> > directory)
> > 
> > Il 04/10/2011 21:34, Greg KH ha scritto:
> > > diff --git a/drivers/staging/hv/hyperv_vmbus.h b/drivers/hv/hyperv_vmbus.h
> > > similarity index 99%
> > > rename from drivers/staging/hv/hyperv_vmbus.h
> > > rename to drivers/hv/hyperv_vmbus.h
> > > index 3d2d836..8261cb6 100644
> > > --- a/drivers/staging/hv/hyperv_vmbus.h
> > > +++ b/drivers/hv/hyperv_vmbus.h
> > > @@ -28,8 +28,7 @@
> > >  #include <linux/list.h>
> > >  #include <asm/sync_bitops.h>
> > >  #include <linux/atomic.h>
> > > -
> > > -#include "hyperv.h"
> > > +#include <linux/hyperv.h>
> > >
> > >  /*
> > >   * The below CPUID leaves are present if
> > VersionAndFeatures.HypervisorPresent
> > 
> > git's rename detection snips away this gem:
> > 
> > +#define HV_LINUX_GUEST_ID_LO		0x00000000
> > +#define HV_LINUX_GUEST_ID_HI		0xB16B00B5
> > +#define HV_LINUX_GUEST_ID		(((u64)HV_LINUX_GUEST_ID_HI
> > << 32) | \
> > +					   HV_LINUX_GUEST_ID_LO)
> > 
> > Somone was trying to be funny, I guess.
> > 
> > KY, I suppose you have access to Hyper-V code or can ask someone who does.
> > Is this signature actually used in the Hyper-V host code?
> 
> Paolo,
> 
> As I noted earlier, this is just a guest ID that needs to be registered with the
> hypervisor.  Thanks  for reporting this issue and on behalf of Microsoft, I would
> like to  apologize for this offensive string. I have submitted a patch to fix this issue. 

You only changed it to be in decimal, you did not change the id at all.
Is there some reason why you can not change it?  You said there was a
reserved range of ids that could be used, perhaps just pick another one?
What is the valid range that can be used here?

thanks,

greg k-h
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